Another kind of Heart Seed is the Pretty Cure Seed (Seed of Pretty Cure), which is a Heart Seed inside the heart which can only be summoned by a fairy from the Tree of Hearts. The Pretty Cure Seed is the mark of a Cure, and by putting it inside the Heart or Shiny Perfume, it is possible for those with Pretty Cure Seeds to transform. The Pretty Cure Seeds do not necessarily need to have the same color as the person's Heart Flower's Heart Seed, as Erika Kurumi's Pretty Cure Seed is dark blue despite her Heart Flower bearing a light blue Heart Seed. An advanced version of the Pretty Cure Seed is the Super Pretty Cure Seed, which is used to retransform Pretty Cure into Super Pretty Cure. It is also used to enter the Pretty Cure Palace.